Chemical and sensory analysis of commercial tomato juices present on the Italian and Spanish markets.

A quantitative descriptive analysis was developed to characterize the sensory quality of a set of 12 organic and conventional tomato juices sold in Spanish and Italian markets. The volatile compounds of tomato juices were also studied. Twelve sensory descriptors, selected by a trained panel, evaluated the sensory profile of the samples. Some tomato juices were characterized by dominant positive notes typical of tomatoes (tomato paste, vegetable notes), whereas others by negative sensory attributes (off-flavors, high intensity of acidity, and sweetness). The volatile pattern of the samples, studied by SPME/GC-MS, was correlated with the sensory results: basically, organic tomato juices were characterized by vegetable notes and higher volatile compounds than conventional samples, regardless of their geographical origin. Conventional tomato juices were grouped in a closer cluster, whereas organic tomato juices were more diversified. Moreover, "defective" samples showed higher amounts of 3-methyl-1-butanol.

[1]  Robert L. Shewfelt,et al.  Flavor quality of fresh tomato (Lycopersicon esculentum Mill.) as affected by sugar and acid levels , 1995 .

[2]  M. Mari,et al.  Control of Penicillium expansum by plant volatile compounds , 2006 .

[3]  John E. Thompson,et al.  Subcellular generation and distribution of lipid-derived volatiles in the ripe tomato , 1997 .

[4]  Emin Yilmaz,et al.  Oxylipin Pathway in the Biosynthesis of Fresh Tomato Volatiles , 2001 .

[5]  R. Lamuela-Raventós,et al.  A metabolomic approach differentiates between conventional and organic ketchups. , 2011, Journal of agricultural and food chemistry.

[6]  J. Carson,et al.  Isolation of S-Methyl Methionine Sulfonium Salt from Fresh Tomatoes , 1966 .

[7]  L. P. Christensen,et al.  Effect of organic growing systems on sensory quality and chemical composition of tomatoes , 2006 .

[8]  J. Weisburger.  Lycopene and Tomato Products in Health Promotion 1 , 2002, Experimental biology and medicine.

[9]  D. Joyce,et al.  Characteristics of banana fruit from nearby organic versus conventional plantations: A case study , 2004 .

[10]  Maurizio Canavari,et al.  Quality evaluation of cold pressed sunflower oils by sensory and chemical analysis , 2011 .

[11]  R. Buttery,et al.  Quantitative and sensory studies on tomato paste volatiles , 1990 .

[12]  V Worthington,et al.  Effect of agricultural methods on nutritional quality: a comparison of organic with conventional crops. , 1998, Alternative therapies in health and medicine.

[13]  M. Servili,et al.  A 3-year Study on Quality, Nutritional and Organoleptic Evaluation of Organic and Conventional Extra-Virgin Olive Oils , 2008 .

[14]  T. Loughin,et al.  Consumer sensory analysis of organically and conventionally grown vegetables. , 2007, Journal of food science.

[15]  F. Gutiérrez,et al.  Influence of ecological cultivation on virgin olive oil quality , 1999 .

[16]  E. Conte,et al.  Sample preparation for the analysis of flavors and off-flavors in foods. , 2000, Journal of chromatography. A.

[17]  John W. Scott,et al.  Linking Sensory Descriptors to Volatile and Nonvolatile Components of Fresh Tomato Flavor , 2003 .

[18]  F. Ruiz-Beviá,et al.  Quantitative analysis of flavour volatiles detects differences among closely related traditional cultivars of tomato , 2005 .

[19]  R. Buttery,et al.  Fresh tomato aroma volatiles: a quantitative study , 1987 .

[20]  I. S. Fagerson.  Thermal degradation of carbohydrates; a review , 1969 .

[21]  L. Johansson,et al.  Sensory evaluation of carrots from ecological and conventional growing systems , 1998 .

[22]  Alexander Medina-Remón,et al.  Is there any difference between the phenolic content of organic and conventional tomato juices , 2012 .

[23]  J. Takabayashi,et al.  Volatile herbivore-induced terpenoids in plant-mite interactions: Variation caused by biotic and abiotic factors , 1994, Journal of Chemical Ecology.

[24]  H. Willer,et al.  The World of Organic Agriculture. Statistics and Emerging Trends 2012 , 2008 .

[25]  F. V. Wassenhove,et al.  Effect of nitrogen fertilizers on celery volatiles , 1990 .

[26]  T. Galliard,et al.  The enzymic breakdown of lipids to volatile and non‐volatile carbonyl fragments in disrupted tomato fruits , 1977 .

[27]  H. Schutz,et al.  CONSUMER PREFERENCES FOR VEGETABLES GROWN UNDER “COMMERCIAL” AND “ORGANIC” CONDITIONS , 1976 .

[28]  N. S. Janzantti,et al.  Volatile compounds from organic and conventional passion fruit (Passiflora edulis f. flavicarpa) pulp. , 2011 .

[29]  R. Lamuela-Raventós,et al.  Screening of the polyphenol content of tomato-based products through accurate-mass spectrometry (HPLC-ESI-QTOF). , 2011, Food chemistry.

[30]  O. Martín‐Belloso,et al.  Volatile compounds and changes in flavour-related enzymes during cold storage of high-intensity pulsed electric field- and heat-processed tomato juices. , 2010, Journal of the science of food and agriculture.

[31]  J. Tumlinson,et al.  Plant volatiles as a defense against insect herbivores , 1999, Plant physiology.

[32]  G. Russell,et al.  Effects of Processing on Tomato Bioactive Volatile Compounds , 2002 .